Example usage of the rating widget from https://ng-bootstrap.github.io

<!DOCTYPE html>
<html>

<head>
  <base href="." />
  <title>ng-bootstrap demo</title>
  <link rel="stylesheet" href="http://v4-alpha.getbootstrap.com/dist/css/bootstrap.min.css" />
  <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
  <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
  <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
  <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
  <script src="config.js"></script>
  <script>
    System.import('app').catch(console.error.bind(console));
  </script>
</head>

<body>
  <my-app>loading...</my-app>
</body>

</html>

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  map: {

    'app': './src',

    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',

    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',

    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.2/lib/typescript.js',

    '@ng-bootstrap/ng-bootstrap': 'npm:@ng-bootstrap/ng-bootstrap/bundles/ng-bootstrap.js'
  },
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)


import { Component, NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { JsonpModule } from '@angular/http';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import { NgbdRatingDecimal } from './rating-decimal';

@Component({
  selector: 'my-app',
  template: `
    <div class="container-fluid">
    
    <hr>
    <p>
      This is a demo plnkr forked from the <strong>ng-bootstrap</strong> project: Angular 2 powered Bootstrap.
      Visit <a href="https://ng-bootstrap.github.io/" target="_blank">https://ng-bootstrap.github.io</a> for more widgets and demos.
    </p>
    <hr>

    <ngbd-rating-decimal></ngbd-rating-decimal>
  </div>
  `
})
export class App {
}   

@NgModule({
  imports: [BrowserModule, FormsModule, ReactiveFormsModule, JsonpModule, NgbModule.forRoot()], 
  declarations: [App, NgbdRatingDecimal]
  bootstrap: [App]
}) 
export class AppModule {}

import {Component} from '@angular/core';

@Component({
  selector: 'ngbd-rating-decimal',
  templateUrl: 'src/rating-decimal.html',
  styles: [`
    .star {
      position: relative;  
      display: inline-block;
      font-size: 3rem;
      color: #d3d3d3;
    }
    .full {
      color: red;
    }
    .half {
      position: absolute;
      display: inline-block;
      overflow: hidden;
      color: red;
    }
  `]
})
export class NgbdRatingDecimal {
  currentRate = 3.14;
}

<p>Custom rating template provided via a variable. Shows fine-grained rating display</p>

<template #t let-fill="fill">
  <span *ngIf="fill === 100" class="star full">&hearts;</span>
  <span *ngIf="fill === 0" class="star">&hearts;</span>
  <span *ngIf="fill < 100 && fill > 0" class="star">
    <span class="half" [style.width.%]="fill">&hearts;</span>&hearts;
  </span>
</template>

<ngb-rating [(rate)]="currentRate" [starTemplate]="t" [readonly]="true" max="5"></ngb-rating>

<hr>
<pre>Rate: <b>{{currentRate}}</b></pre>
<button class="btn btn-sm btn-outline-primary" (click)="currentRate = 1.35">1.35</button>
<button class="btn btn-sm btn-outline-primary" (click)="currentRate = 4.72">4.72</button>